1/*
2 Copyright (c) Marshall Clow 2017.
3
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6*/
7
8/// \file transform_exclusive_scan.hpp
9/// \brief ????
10/// \author Marshall Clow
11
12#ifndef BOOST_ALGORITHM_TRANSFORM_EXCLUSIVE_SCAN_HPP
13#define BOOST_ALGORITHM_TRANSFORM_EXCLUSIVE_SCAN_HPP
14
15#include <functional> // for std::plus
16#include <iterator> // for std::iterator_traits
17
18#include <boost/config.hpp>
19#include <boost/range/begin.hpp>
20#include <boost/range/end.hpp>
21#include <boost/range/value_type.hpp>
22
23namespace boost { namespace algorithm {
24
25/// \fn transform_exclusive_scan ( InputIterator first, InputIterator last, OutputIterator result, BinaryOperation bOp, UnaryOperation uOp, T init )
26/// \brief Transforms elements from the input range with uOp and then combines
27/// those transformed elements with bOp such that the n-1th element and the nth
28/// element are combined. Exclusivity means that the nth element is not
29/// included in the nth combination.
30/// \return The updated output iterator
31///
32/// \param first The start of the input sequence
33/// \param last The end of the input sequence
34/// \param result The output iterator to write the results into
35/// \param bOp The operation for combining transformed input elements
36/// \param uOp The operation for transforming input elements
37/// \param init The initial value
38///
39/// \note This function is part of the C++17 standard library
40template<class InputIterator, class OutputIterator, class T,
41 class BinaryOperation, class UnaryOperation>
42OutputIterator transform_exclusive_scan(InputIterator first, InputIterator last,
43 OutputIterator result, T init,
44 BinaryOperation bOp, UnaryOperation uOp)
45{
46 if (first != last)
47 {
48 T saved = init;
49 do
50 {
51 init = bOp(init, uOp(*first));
52 *result = saved;
53 saved = init;
54 ++result;
55 } while (++first != last);
56 }
57 return result;
58}
59
60}} // namespace boost and algorithm
61
62#endif // BOOST_ALGORITHM_TRANSFORM_EXCLUSIVE_SCAN_HPP
63

source code of boost/libs/algorithm/include/boost/algorithm/cxx17/transform_exclusive_scan.hpp